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    <link rel="stylesheet" href="homework03.css" />
    <title>homework03微信菜单</title>
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  <body>
    <header></header>
    <main></main>
    <footer>
      <div class="menu">
        <a href="#">菜单A</a>
        <div class="second-menu">
          <a href="#">菜单A-1</a>
          <a href="#">菜单A-2</a>
          <a href="#">菜单A-3</a>
        </div>
      </div>
      <div class="menu"><a href="#">菜单B</a></div>
      <div class="menu"><a href="#">菜单C</a></div>
    </footer>
  </body>
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